The operating system , also referred to as the OS, is the most
             important software on the computer. It is responsible for
             providing an interface with the hardware, displaying an interface
             for users to work with, and acting as a base for other software
             programs to be run on. Without an operating system, a computer would be
             nearly useless .When a computer first starts, the BIOS (Basic Input
             Output System is the first thing to load. This BIOS performs several basic
             tasks, before looking for the Operating System to load. It can
             be booted from any source - such as a floppy disk or CD-ROM -
             but it is more commonly found to be on the computer's hard
             drive.Once the Operating System has been located, the kernel
             of the operating system is usually loaded. The kernel is the core
             of the operating system and it handles the majority of low-level
             activities, such as controlling hardware through specific
             written software known as drivers. The kernel then loads
             further parts of the operating system as necessary. This
             includes the user interface (or shell) so that the user can
             interact with the computer.The shell will usually provide the
             user with a platform from which they can navigate file systems,
             run utilities and run applications software.
             There are four basic types of Operating System:
             - Batch, Real Time, Interactive, Network
             Batch systems were the first in existence and can still be
             found on some mainframes today running batches of jobs.
             Examples can often be hard to think of, but tasks such as
             processing tax demands have always been best suited to batch
             Real Time operating systems need to have a quick response so
             that data processing can be kept up-to-date and accurate - this
             if often used in situations such as air flight booking, or it could
             be embedded in something as precise as a missile.
             When an operating system relies on a lot of input from the
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